Telescopic suction tubes



Feb. 26, 1957 J, FURSTENBERG 2,782,589

TELESCOPIC SUCTION TUBES Filed June 25, 1952 IN V EN TOR.

JOACHIM FURSTENBERG nited States Patent TELESCOPIC SUCTION TUBES Joachim Furstenberg, Esslingen (Neckar), Germany, as-

signor to Pneumafil Corporation, Charlotte, N. (7., a corporation of Delaware Application June 25, 1952, Serial No. 295,466

4 Claims. (Cl. 57-345) This invention relates to thread suction installations for spinning machines, which as well known are employed for sucking up broken threads, loose fibres and other fly from the range of the drafting rollers, and more particularly of the fluted cylinder located on the outlet side of the drafting gear. Such installations comprise in the main a conduit system having suction nozzles for the individual spindles, a blower for creating a reduced pressure at these nozzles, and a filter for separating the foreign matter from the air sucked up before the latter is returned on the pressure side of the blower into the spinning room.

Upon the occurrence of a broken thread, the thread in question must be connected anew, i. e., it must be rejoined with the fibrous material coming from the feed roller. For this purpose it is necessary for the operator to extract from the suction tube the broken end of the thread which has been sucked into the tube. A manipulation of this nature, however, occasions considerable clifliculties when the suction tube is in its normal operative position since for purposes of obtaining a good suctional effect at the point in question, the nozzle opening of the tube is situated very near to the fluted cylinder, and consequently is not readily accessible.

To overcome this drawback it has been proposed to arrange the suction nozzles pertaining to the individual spindles in such a way that they can be rocked out of their operative position in the proximity of the drafting rollers into a position remote therefrom. In the case of such rocking movement, which preferably takes place in a vertical plane, the length of the nozzle pipe remains substantially unaltered.

On the grounds that it is desirable not to be dependent solely on the solution just referred to, this invention is concerned with the problem of providing another method of eliminating the stated difficulties. According to the invention it is proposed to make the nozzle tube or the nozzles freely shiftable in an axial direction away from the drafting rollers.

As a particular feature of the invention, means are provided for precise axial guiding of shiftable nozzle tubes, which open out in direct fashion into the collecting conduit. The nozzles are supported at two points by bearings, the bearing point directed towards the collecting conduit preferably being formed by a supporting ring, which is connected on the one hand with the collecting conduit and on the other hand with a device such as a stufiing box effecting a seal against the outside of the tube. Further, it is also possible in this connection to provide means for holding the suction tube in three different positions, of which the middle one is the normal suction position.

Furthermore the invention can also be employed in connection with suction tubes of T-form or L-form. The nozzles pertaining to the individual spindles and opening into a suction tube of this character being arranged to be axially movable, whilst the suction tube in turn is connected with the collecting conduit in usual fashion.

2,782,589 Patented Feb. 26, 1957 Other details of the subject matter of the invention, and the advantages obtained thereby, are apparent from the embodiment hereinafter described in connection with the accompanying drawings in which:

Fig. 1 is an elevational view of the new arrangement, having a longitudinally shiftable nozzle tube opening into the collecting conduit.

Fig. 2 is a view similar to Fig. 1, but with a somewhat different method of sealing the nozzle tube.

Fig. 3 is an enlarged schematic detail of the front portion of a nozzle tube according to Fig. 1 or Fig. 2 showing the nozzle in dilferent positions in relation to the drafting rollers.

In connection with the drafting gear of a spinning machine the fluted roller located on the outlet side for the yarn 1 is designated 2, and the pressure roller bearing against the same is designated 3 (see Figs. 1 to 3). In the known manner the individual threads are arranged parallel to one another over the length of the drafting rollers and pass through lappets 5, which are mounted on a thread guide 4, to the spindles (not shown).

In the embodiment illustrated in Figs. 1 to 3, suction tubes 7 open into a collecting conduit 6, of the thread suction installation, which conduit is arranged parallel to the drafting rollers. Each of the suction tubes is" supported at two points to be shiftable in its longitudinal direction, and in the normal operative position according to Figs. 1 and 2 extends with its oblique inlet end to a point in close proximity below the fluted roller. The bearing point directed towards this end is situated in a fixed holder 8, thru which tube 7 is slidably passed, and to which above and below the tube there is secured in each case a flat spring 10, 11. At their free ends the fiat springs are so constructed that they are capable at this point of engaging one of three rings 1214 rigidly mounted at certain distances apart on the tube 7. When in accordance with Figs. 1 and 2 the middle ring 13 engages with the flat springs 10, 11, the tube 7 is in its normal operative position.

The other bearing point of the tube 7 is formed by a supporting ring 15 which, extending from the edge of an opening 16 in the side wall of the collecting conduit 6, surrounds coax'ia-lly the outlet end of the tube projecting into this opening. With the front, free end of the supporting ring 15 there is connected a device for effecting sealing against the outer face of the tube 7 in the manner of a stuffing box, which device according to Fig. 1 may consist of a simple rubber sleeve 17, or according to Fig. 2 of a diaphragm 18, which on the inner part tightly surrounds the tube and on the outer portion is fitted into a funnel-shaped member 19, which may be produced, for example, from aluminum and in turn is connected to the supporting ring 15.

The displacement of the nozzle tube 7 takes place by hand by means of a projection 20 provided at the front end on the lower side thereof.

When a broken thread occurs, this broken thread will be sucked into the respective nozzle tube 7 for such time until the operator is ready to join up the thread. For this operation the tube is manipulated by means of the projection 20 out of the normal operative position, which is designated I in Fig. 3, into the position II indicated in dash-dotted lines. The ring 14 engages thereby the fiat springs 10, 11, so that a self-acting return movement is avoided. At the same time the broken thread is lifted to such extent away from the fluted cylinder by the nozzle aperture of the suction tube that the operator can readily pick up the thread in her hands for the purpose of joining it anew, i. e., connecting it with the already spun thread of the cop. The suctional effect remains substantially maintained also in position 11.

After the thread has again been joined, the tube in question is moved by hand back into the operative position I.

In certain cases, for example in the case of dyed or heavier yarn, it may occur that on the drafting rollers, and in particular on the fluted roller, laps are formed, which are not removed by the suction of the nozzle tubes but must be eliminated by hand in order to avoid interference with the spinning operation. For this purpose the operator normally employs a hook. Operations with a hook of this nature, however, are rendered difficult by the suction tube in its operative position and may also lead to damage to the same. This difficulty is avoided in the present case by the fact that the suction tube can be moved out of position I also in the opposite direction into the position III, which is likewise indicated in Fig. 3 in dash-dotted lines, and in which the front ring 12 engages the flat springs 10, 11. In this position the fluted cylinder can readily be cleaned about the periphery without being impaired by and without damage to the suction tube. This position moreover has the additional advantage that the suctional effect is now immediately directed on to the yarn following up, and thus a renewed lap formation is prevented assuming that that already formed takes some time to remove;

The above disclosure has been given by way of illustration and elucidation and not by way of limitation, and it is desired to protect all embodiments of the herein disclosed inventive concept, within the scope of the appended claims.

I claim:

I. In combination with a thread suction installation for a spinning machine having drafting rollers for drafting threads, at least one nozzle tube placed transversely of the drafting rollers adjacent the thread passing therethrough, said tube communicating with a collecting conduit, and means permitting said tube to be rapidly shifted in an axial direction away from the drafting rollers upon the occurrence of a broken thread to permit an operator to work freely between the nozzle end of a tube and the drafting rollers to mend the break, said means permitting the tube to be restored to initial position when the thread is mended, said means supporting the tube at spaced points, said means at one of said points including a supporting ring connected with the collecting conduit and having a stuffing box effecting a seal with the outside of the tube, and a holder at another of the points spaced from the supporting ring and stuffing box.

, '2. In combination with a thread suction installation for a spinning machine having drafting rollers for drafting threads, at least one nozzle tube placed transversely of the drafting rollers adjacent the thread passing therethrough, said tube communicating with a collecting conduit, and means permitting said tube to be shifted in an axial direction away from the drafting rollers upon the occurrence of a broken thread to permit an operator to work freely between the nozzle end of a tube and the drafting rollers to mend the break, said means permitting the tube to be restored to initial operating position when the thread is mended, said means including three spaced members mounted on the nozzle tube and flexible means to cooperate with said members so that the nozzle end may be placed in three diflerent positions as desired.

3. In combination with a thread suction installation for a spinning machine having drafting rollers for drafting threads, at least one nozzle tube placed transversely of the drafting rollers adjacent the thread passing therethrough, said tube communicating with a collecting conduit and means permitting said tube to be shifted in an axial direction away from the drafting rollers upon the occurrence of a broken thread to permit an operator to Work freely between the nozzle end of a tube and the drafting rollers to mend the break, said means permitting the tube to be restored to initial operating position when the thread is mended, said means including a supporting ring attached to the conduit into which the tube extends, a funnel shaped member connected to the supporting ring and surrounding the tube and a diaphragm secured in the funnel shaped member and tightly surrounding the tube.

4. The combination according to claim 3 in which the nozzle tube has three spaced members mounted thereon and flexible means to cooperate with said members so that the nozzle end may be placed in three different positions as desired.

References Cited in the file of this patent UNITED STATES PATENTS 2,511,928 Mansfield et al. June 20, 1950 2,522,250 Bechtler Sept. 12, 1950 FOREIGN PATENTS 25,796 Great Britain Nov. 9, 1909 268,812 Switzerland June 15, 1950 652,311 Great Britain Apr. 18, 1951 652,661 Great Britain Apr. 25, 1951 668,351 Great Britain Mar. 12, 1952 851,546 France Oct. 2, 1939 

